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    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <style>
        .title{
            text-align: center;
        }
        div{
            width: 100%;
            height: 30px;
            position: absolute;
             top: 30%;
             left: 50%;
             transform: translate(-50%,-50%);
       }
    </style>
    <title>Document</title>
</head>
<body>
    <div>
        <h1 class="title" >HELLO WORLD! Welcom to my Back System</h1>
    </div>
         
</body>
</html>